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® IGCSE is the registered trademark of Cambridge International Examinations.
This document consists of 14 printed pages.
© UCLES 2016 [Turn over
Cambridge International Examinations Cambridge International Advanced Subsidiary and Advanced Level
COMPUTER SCIENCE 9608/21
Paper 2 Written Paper May/June 2016
MARK SCHEME
Maximum Mark: 75
Published
This mark scheme is published as an aid to teachers and candidates, to indicate the requirements of the examination. It shows the basis on which Examiners were instructed to award marks. It does not indicate the details of the discussions that took place at an Examiners’ meeting before marking began, which would have considered the acceptability of alternative answers. Mark schemes should be read in conjunction with the question paper and the Principal Examiner Report for Teachers. Cambridge will not enter into discussions about these mark schemes. Cambridge is publishing the mark schemes for the May/June 2016 series for most Cambridge IGCSE
®,
Cambridge International A and AS Level components and some Cambridge O Level components.
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Page 2 Mark Scheme Syllabus Paper
Cambridge International AS/A Level – May/June 2016 9608 21
© Cambridge International Examinations 2016
Question Answer Marks
1 (a) (i)
Item Statement Selection Iteration Assignment
1 MyScore = 65 �
2 FOR IndexVal = 0 TO 99 �
3 MyArray[3] = ID(MyString,3,2) �
4 IF MyScore >= 70 THEN �
5 ENDWHILE �
6 ELSE Message = "Error" � �
One mark per row Additional ticks in any row cancels that row
6
(ii)
Item Purpose of statement
1 Assign 65 to MyScore
2 (Start of) loop with loop counter starting from zero & going to 99 / repeating 100 times
3 Assign 2 chars from position 3/4 in MyString to MyArray element 3/4
4 Test if MyScore is greater than or equal to 70
5 Marks the end of WHILE / precondition loop //Return to top of loop to
check condition
6 If a condition is FALSE, variable Message is assigned the value "ERROR"
Exact wording not important Explanation must refer to variables or values used in code (except for row 5)
6
(iii)
Expression Result
"D" & RIGHT(MyString, 4) "Dance"
LEFT(RIGHT(MyString, 7), 3) "ten"
Must have correct case Quotation marks optional
2
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Page 3 Mark Scheme Syllabus Paper
Cambridge International AS/A Level – May/June 2016 9608 21
© Cambridge International Examinations 2016
Question Answer Marks
2 (a)
Identifier Data Type Description
AlarmState BOOLEAN Alarm is set to ON or OFF
SensorValue INTEGER
Value / number from sensor / as input by user // used in calculation of Temperature
ThresholdValue REAL / FLOAT /
SINGLE / DOUBLE Threshold value for comparison
Temperature REAL / FLOAT /
SINGLE / DOUBLE Temperature value calculated from sensor value
One mark per row Data types as shown Descriptions given above are examples only
4
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Page 5 Mark Scheme Syllabus Paper
Cambridge International AS/A Level – May/June 2016 9608 21
© Cambridge International Examinations 2016
Question Answer Marks
3 (a) FUNCTION EncryptString (LookUp : ARRAY, PlainText : STRING) RETURNS STRING
DECLARE OldChar, NewChar : CHAR DECLARE OldCharValue : INTEGER DECLARE OutString: STRING
//first initialise the return string
OutString ← "" //initialise the return string
//loop through PlainText to produce OutString
FOR n ← 1 to LENGTH(PlainText) //from first to last character
OldChar ← MID(PlainText, n, 1) //get next character
OldCharValue ← ASC(OldChar) //find the ASCII value NewChar ← Lookup[OldCharValue] //look up substitute character
OutString ← Outstring & NewChar // concatenate to OutString
ENDFOR
RETURN OutString // EncryptString ← OutString
ENDFUNCTION
One mark for each part-statement (shown underlined and bold)
10
(b) (i) VB: Dim Lookup(0 to 127 / 128) As CHAR
Pascal: Var Lookup: Array[0..127 / 1..128] Of CHAR
Python: Lookup = ["" for i in range(128)]
OR
Lookup = []
For i in range(128) :
Lookup.append("")
Mark as follows: VB / Pascal: one mark per part-statement as underlined and bold Python: One mark for Lookup and []
One mark for range(128)
2
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Page 8 Mark Scheme Syllabus Paper
Cambridge International AS/A Level – May/June 2016 9608 21
© Cambridge International Examinations 2016
Question Answer Marks
(ii) Problem:
• When retrieving / searching for / editing (text relating to a particular CD)
• Can’t tell where the artist name stops and the title begins (or any similar explanation or example)
Solution 1:
• Use of a separator character// or by example
• Where the separator character does not occur in the original strings Solution 2:
• Use a fixed number of characters for each data item
• Data items are padded with e.g. <Space> character where needed Solution 3:
• Convert original data items to CamelCase
• …and add a Space separator Mark as follows: Two marks for description of problem Two marks for description of solution
4
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Page 9 Mark Scheme Syllabus Paper
Cambridge International AS/A Level – May/June 2016 9608 21
© Cambridge International Examinations 2016
Question Answer Marks
(b) 'Pseudocode' solution included here for development and clarification of mark scheme. Programming language solutions appear in the Appendix. PROCEDURE InputData()
DECLARE CDTitle : STRING
DECLARE CDArtist : STRING
DECLARE CDLocation : STRING
DECLARE FileData : STRING
OPENFILE "MyMusic" FOR WRITE
OUTPUT "Input CD Title"
INPUT CDTitle
WHILE CDTitle <> "##"
OUPUT "Input CD Artist"
INPUT CDArtist
OUPUT "Input CD Location"
INPUT CDLocation
FileData = CDTitle & ':' & CDArtist & ':' &
CDLocation
WRITEFILE "MyMusic.txt", FileData
OUTPUT "Input CD Title"
INPUT CDTitle
ENDWHILE
CLOSEFILE("MyMusic.txt ")
ENDPROCEDURE
One mark for each of the following:
• Procedure heading and ending
• Declaration of CDTitle, CDArtist and CDLocation
• Open file for writing (Allow MyMusic or MyMusic.txt)
• Working conditional loop structure including test for rogue value (including initial input of CDTitle)
• Input of three data values (CDTitle, CDArtist and CDLocation) inside a
loop
• String concatenation of three variables inside a loop
• Write three variables in single line to file inside a loop
• Close file
• Use of string separator Solutions may repeatedly OPEN – WRITE – CLOSE within the loop.In this case the first
OPEN could be in WRITE or APPEND mode with all others in APPEND.
Max 8
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Page 11 Mark Scheme Syllabus Paper
Cambridge International AS/A Level – May/June 2016 9608 21
© Cambridge International Examinations 2016
Appendix - Program Code Solutions 3 (b) (ii): VB.NET Console.Write("Enter start position: ")
StartPos = Console.ReadLine()
Console.Write("Enter number to change: ")
NumToChange = Console.ReadLine()
For n = 0 To NumToChange - 1
Console.Write("Enter new value for position: ")
NewChar = Console.ReadLine()
Lookup(StartPos + n) = NewChar
Next
Console.WriteLine(NumToChange & " entries changed")
ALTERNATIVE: Console.Write("Enter start position: ")
StartPos = Console.ReadLine()
Console.Write("Enter number to change: ")
NumToChange = Console.ReadLine()
n = 0
Do
Console.Write("Enter new value for position: ")
NewChar = Console.ReadLine()
Lookup(StartPos + n) = NewChar
n = n + 1
Loop Until n = NumToChange
Console.WriteLine(NumToChange & " entries changed")
3 (b) (ii): Pascal write('Enter start position: ');
readln(StartPos);
write('Enter number to change: ');
readln(NumToChange);
for n := 0 to NumToChange - 1 do
begin
write('Input new value for position: ');
readln(NewChar);
LookUp[Startpos + n] := NewChar;
end;
writeln(IntToStr(NumToChange) + ' entries changed');
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Page 12 Mark Scheme Syllabus Paper
Cambridge International AS/A Level – May/June 2016 9608 21
© Cambridge International Examinations 2016
ALTERNATIVE: write('Enter start position: ');
readln(StartPos);
write('Enter number to change: ');
readln(NumToChange);
n := 0;
repeat
write('Input new value for position: ');
readln(NewChar);
LookUp[Startpos + n] := NewChar;
n := n + 1;
until (n = NumToChange);
writeln(IntToStr(NumToChange) + ' entries changed');
3 (b) (ii): Python StartPos = int(input("Enter start position: "))
NumToChange = int(input("Enter number to change: "))
for n in range(NumToChange) :
NewChar = input("Input new value for position: ")
LookUp[StartPos + n - 1] = NewChar
print(str(NumToChange) + " entries changed")
ALTERNATIVE: StartPos = int(input("Enter start position: "))
NumToChange = int(input("Enter number to change: "))
n = 0
while n < NumToChange :
NewChar = input("Input new value for position: ")
LookUp[StartPos + n] = NewChar
n = n + 1
print(str(NumToChange) + " entries changed")
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Page 13 Mark Scheme Syllabus Paper
Cambridge International AS/A Level – May/June 2016 9608 21
© Cambridge International Examinations 2016
5 (b): VB.NET A StreamWriter() solution: Sub InputData()
Dim CDTitle, CDArtist, CDLocation As String
Dim FileHandle As IO.StreamWriter
FileHandle = New IO.StreamWriter("MyMusic.txt") ("MyMusic.txt") Console.WriteLine("Input CD Title: ")
CDTitle = Console.ReadLine()
Do Until CDTitle = "##"
Console.WriteLine("Input CD Artist: ")
CDArtist = Console.ReadLine()
Console.WriteLine("Input CD Location: ")
CDLocation = Console.ReadLine()
FileHandle.WriteLine(CDTitle & ":" & CDArtist & ":" & CDLocation)
Console.WriteLine("Input CD Title: ")
CDTitle = Console.ReadLine()
Loop
FileHandle.Close()
End Sub
A legacy FileOpen() solution: Sub InputData()
Dim CDTitle, CDArtist, CDLocation As String
FileOpen(1, "MyMusic", OpenMode.Output)
Console.WriteLine("Input CD Title: ")
CDTitle = Console.ReadLine()
Do Until CDTitle = "##"
Console.WriteLine("Input CD Artist: ")
CDArtist = Console.ReadLine()
Console.WriteLine("Input CD Location: ")
CDLocation = Console.ReadLine()
Print(1, CDTitle & ":" & CDArtist & ":" & CDLocation)
Console.WriteLine("Input CD Title: ")
CDTitle = Console.ReadLine()
Loop
FileClose(1)
End Sub
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Page 14 Mark Scheme Syllabus Paper
Cambridge International AS/A Level – May/June 2016 9608 21
© Cambridge International Examinations 2016
5 (b): Pascal procedure InputData;
var
CDTitle, CDArtist, CDLocation : string;
CDFile : Textfile;
begin
assign(CDFile, 'MyMusic');
rewrite(CDFile);
writeln('Input CD Title: ');
readln(CDTitle);
while (CDTitle <> '##') do
begin
writeln('Input CD Artist: ');
readln(CDArtist);
writeln('Input CD Location: ');
readln(CDLocation);
writeln(CDFile, CDTitle + ':' + CDArtist + ':' + CDLocation);
writeln('Input CD Title: ');
readln(CDTitle);
end;
close(CDFile);
end;
5 (b): Python def InputData() :
#CDTitle String (or CDTitle = "")
#CDArtist String (or CDArtist = "")
#CDLocation String (or CDLocation = "")
FileHandle = open("MyMusic", "w")
CDTitle = input("Input CD Title: ")
while CDTitle != "##" :
CDArtist = input("Input CD Artist: ")
CDLocation = input("Input CD location: ")
FileHandle.write(CDTitle + ":" + CDArtist + ":" + CDLocation)
CDTitle = input("Input CD Title: ")
FileHandle.close()
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